SKY HOOK U.S. Marines attending the Helicopter Rope Suspension Techniques Masters Course perform Special Patrol Insertion/Extraction from a CH-46E Sea Knight helicopter at the Central Training Area on Camp Hanson, Okinawa, Japan, Aug. 4, 2010. SHARE IMAGE: Download Image: Full Size (0.05 MB) Photo By: VIRIN: 109691-B-UPS39-191.jpg Photo Gallery